Obverse:

PHILIP ET MARIA D G REX ET REGINA ANG. Facing busts of Philip and Mary, crown above. Date 1554 below bust.

Reverse:

POSVIMVS DEVM ADIVTOR[EM N]OSTRVM. Oval garnished shield with arms of Spain and England, crown dividing value mark XII above.

A few marks, about fair but exceedingly rare and a type that's absent from the majority of collections. 

Ex Noonans Auction, 29 May 2025 - Lot 2184